作者:Vern G. DeVries、Jonathan D. Bloom、Minu D. Dutia、Andrew S. Katocs、Elwood E. Largis
DOI:10.1021/jm00130a016
日期:1989.10
of the urea backbone. This study culminated in the selection of N'-(2,4-dimethylphenyl)-N-benzyl-N-n-butylurea (115) for more extensive biological evaluation. ACAT inhibitors are seen as potentially beneficial agents against hypercholesterolemia and atherosclerosis.
##STR1## A very mild and efficient approach for the synthesis of ureas is described. Phenyl carbamates were used as intermediates for the preparation of N,N'- substituted ureas. The carbamates were treated with an approximate stoichiometric amount of amine in dimethyl sulfoxide at ambient temperature, generating the ureas in high yield. The reaction was simple, safe, fast, inexpensive, and amenable to large scale production of the product.
Assembly of N,N-disubstituted-N′-arylureas via a copper-catalyzed one-pot three-component reaction of aryl bromides, potassium cyanate, and secondary amines
作者:Hongfei Yin、Bing Chen、Xiaojing Zhang、Xinye Yang、Yihua Zhang、Yongwen Jiang、Dawei Ma
DOI:10.1016/j.tet.2013.04.117
日期:2013.7
A three-component reaction of aryl bromides, potassiumcyanate, and secondary amines takes place at 110 °C in MeCN under the catalysis of Cu2O and 2-(2,6-dimethylphenylamino)-2-oxoacetic acid potassium salt, giving N,N-disubstituted-N′-arylureas in good to excellent yields. A number of functionalized aryl bromides and secondary amines were compatible with these conditions, and thereby providing a facile